[vserver] VServer looks 'limited' in 2.6.38.8

Hi,

today I upgraded a Linux-DRBD-VServer-Heartbeat Cluster from Debian
Lenny via Squeeze to the final kernel 2.6.38.8-vs2.3.0.37-rc17 with
util-vserver 0.30.216-pre2981.
This combination only starts maximum 24 of the 78 VServers that should
be started. They are in 3 groups, each group has its own DRBD-device
mounted like
/var/lib/vservers/vservers_v1/vserver1
/var/lib/vservers/vservers_v2/vserver2
...
/var/lib/vservers/vservers_v2/vserver70
/var/lib/vservers/vservers_v3/vserver71
...
/var/lib/vservers/vservers_v3/vserver74
The single VServer on vservers_v1 works fine, 3 of the 4 on vservers_v3
fail and only 18 succeed on vservers_v2.
Startup gives this error about a failed server and to check with init
if nothing else is printed.
I tried with sysv and plain init style. No difference.
I only updated one side of the cluster kernel-wise, the other still is
debian squeeze 2.6.26-2-vserver-amd64 but uses util-vserver
0.30.216-pre2981 already. There all VServers start up just fine.
If I copy a non-starting VServer to the very same location where it
would be mounted it starts up fine.
If I diff the /etc/vserver/vserver56 and /etc/vserver/vserver57, one is
starting correctly, the other not, there is no difference.
The VServers that startup fine have a new inode ctime in /, /dev and
/etc, those that fail to start still have the same old ctime they had on
creation, sometime between 2009 and today. It looks like some files
there get changed, but the contents of these files is exactly the same
like in a non-starting VServer.
The 3 groups of VServers have 3 different marks to enable me starting
them with the util-vserver init.d-stuff, no mater if I start the default
6 or 100 in parallel, no matter how often I start them, it is always
exactly the same VServers that actually run. If I stop one and try to
start one of the others it still fails.

The side with the older kernel, currently running the VServers:
sirius-c1:~# cat /proc/virtual/status
#CTotal: 85
#CActive: 85
#NSProxy: 170 1203 85 85 85 85 0

sirius-c1:~# cat /proc/virtual/info
VCIVersion: 0002:0303
VCISyscall: 236
VCIKernel: 13000ff1

Linux sirius-c1 2.6.26-2-vserver-amd64 #1 SMP Thu Feb 11 02:19:12 UTC 2010 x86_64 GNU/Linux

The side with the new kernel, refusing to start all VServers:
sirius-c2:/etc/vservers# cat /proc/virtual/status
#CTotal: 0
#CActive: 0
#NSProxy: 0 72 0 0 1 0 0
#InitTask: 2 190 116

sirius-c2:~# cat /proc/virtual/info
VCIVersion: 0002:0308
VCISyscall: 236
VCIKernel: 13000f11

Linux sirius-c2 2.6.38.8-vs2.3.0.37-rc17 #2 SMP PREEMPT Tue Jun 21 16:51:31 CEST 2011 x86_64 GNU/Linux

I am quite lost, what information can I provide to get a hint on what's
wrong?

Regards,
        Adrian

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